(a) Particles in solid (b) Particles in liquid (c) Particles in gas

Solid Liquid Gas Holds Shape Fixed Volume Shape of Container Fixed Volume Shape of Container Volume of Container heat

Solid Liquid Gas heat

State Particle Model ShapeVolumeEnergySolidDefiniteDefinitelowest LiquidIndefiniteDefinite GasIndefiniteIndefinitehighest

 Particles are very tightly packed  Definite shape, definite volume  Particles vibrate but cannot move

 Looser attraction between particles  indefinite shape, definite volume  Particles can tumble over each other  Liquids can flow

 No attraction between particles  indefinite shape, indefinite volume  Particles move rapidly and are in constant motion  Gases can flow

 Discuss with your group which state of matter oobleck should be classified as.  Cite evidence for your answer!  f6U f6U

 Melting  Freezing  Vaporization  Condensation  Deposition  Sublimation

 There is a 4 th state of matter known as plasma.  A plasma is an ionized gas  A plasma is a very good conductor of electricity and is affected by magnetic fields.  Examples:

 A phase diagram is common way to represent the various phases of a substance and the conditions under which each phase exists

solid liquid gas vaporization condensation melting freezing Heat added Temperature ( o C) A B C D E Heating Curve for Water LeMay Jr, Beall, Robblee, Brower, Chemistry Connections to Our Changing World, 1996, page 487

 6. What is the melting point of the substance?  7. What is the boiling point of the substance?  8. What letter on the diagram indicates solid is present only? A B C D

 9. What letter on the diagram indicates a gas is present only?  10. What letter on the diagram indicates a liquid is present only?  11. What letter on the diagram indicates both solid AND liquid are present? A B C D

 Analysis Questions  Claims and Evidence  Reflection Questions  LAB REPORT DUE THURSDAY, APRIL 4 th.

 Endothermic reaction- Energy is gained by the substance as it changes state  Heat is needed/absorbed.  Exothermic reaction-Energy is removed by the substance as it changes state.  Heat is released.

 Melting is when a substance changes from a solid to a liquid.  Do particles gain or lose speed?  The particles increase their speed causing them to break apart from each other.  Endothermic or Exothermic Reaction?  Endothermic  Examples-melting snow or ice

 Condensing is when a substance changes from a gas to a liquid.  Do particles gain or lose speed?  The particles lose their speed causing them to pack a little more closely together.  Endothermic or Exothermic Reaction?  Exothermic Reaction  Example: Cloudy bathroom

 MAKING ICE CREAM!

 CHANGE PROCEDURE #5 TO SAY ½ CUP OF ROCK SALT

solid liquid gas vaporization condensation melting freezing Heat added Temperature ( o C) A B C D E Heating Curve for Water LeMay Jr, Beall, Robblee, Brower, Chemistry Connections to Our Changing World, 1996, page 487